How to solve Shared Preferences not working in flutter? - flutter

Question

I'm using Shared Preferences in flutter , but it not working with me in vs code and andriod studio , after adding dependencies and import the package then try the app nothing happen when clicking on the button which it do the function.
------- this my code in home page --------
import 'package:flutter/material.dart';
import 'package:flutter_application_2/another_screen.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'another_screen.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Shared Preference',
theme: ThemeData(primarySwatch: Colors.blue),
home: const MyHomePage(title: 'Shared Preference'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
void initState() {
super.initState();
setData();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: ElevatedButton(
child: const Text('Go Another Screen'),
onPressed: () {
Navigator.of(context).push(MaterialPageRoute(
builder: (_) => const AnotherScreen(),
));
},
),
),
);
}
setData() async {
SharedPreferences _pref = await SharedPreferences.getInstance();
_pref.setString('name', 'Rady');
_pref.setInt('age', 19);
_pref.setString('university', 'Rady');
_pref.setInt('height', 19);
_pref.setStringList('skills', ['Dart', 'Flutter']);
}
}
----- the second page ------
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
class AnotherScreen extends StatefulWidget {
const AnotherScreen({Key? key}) : super(key: key);
#override
State<StatefulWidget> createState() => AnotherScreenState();
}
class AnotherScreenState extends State<AnotherScreen> {
String _name = '';
int? _age;
String _university = '';
int? _height;
List<String> _skills = ['', ''];
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Info Screen'),
),
body: DefaultTextStyle(
style: const TextStyle(
fontSize: 30, fontWeight: FontWeight.bold, color: Colors.black),
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('Name : $_name'),
Text('Age : $_age'),
Text('University : $_university'),
Text('Height : $_height'),
Text('Skill1 : ${_skills[0]}'),
Text('Skill2 : ${_skills[1]}'),
ElevatedButton(
child: const Text('Get Data'),
onPressed: () async {
await getData();
},
)
],
),
),
),
);
}
getData() async {
SharedPreferences _pref = await SharedPreferences.getInstance();
setState(() {
_name = _pref.getString('name')!;
_age = _pref.getInt('age');
_university = _pref.getString('university')!;
_height = _pref.getInt('height');
_skills = _pref.getStringList('skills')!;
});
}
}

Answer 1

Storing Data in shared preferences requires the await keyword
SharedPreferences _prefs = await SharedPreferences.getInstance();
await _prefs.setString('token', newToken);